Animals only know a few things, eat, drink, shelter, and reproduction. And they do not think of reproduction in the way we do. They breed because of instinct nothing more. If you doubt that, then watch animals during breeding season, while the females are either chasing last years young away or she is busy trying to keep a male from killing her newest so he can breed her again.
* (Swinging club) Whack! whack! whack! *
Nope, the old nag's still dead .